基于波长变换的概率整形正交频分复用光信号传输系统  

Probabiliy Shaping Orthogonal Frequency Division Multiplexing Optical Signal Transmission System Based on Wavelength Conversion

作　　者：胡霞 赵利 余建军[2] Hu Xia;Zhao Li;Yu Jianjun(Airforce Aviation Repair Institute of Technology,Changsha 410124,Hunan,China;School of Information Science and Engineering,Fudan University,Shanghai 200433,China)

机构地区：[1]空军航空维修技术学院,湖南长沙410124 [2]复旦大学信息科学与工程学院,上海200433

出　　处：《激光与光电子学进展》2023年第19期72-76,共5页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61527801,61675048,61720106015)。

摘　　要：本文首先从理论上分析了在共极化双泵浦方案中,波长转换不会改变概率整形(PS)信号的概率分布,并且正交频分复用(OFDM)信号子载波的顺序可以保持不变的原因。然后,通过实验验证了全光波长转换后,PS-64QAM-OFDM信号通过高非线性光纤在零差相干检测系统中的传输。最后,通过实验证明,当波特率为20 Gbaud、误码率为1×10^(-2)时,普通64QAM信号的光信噪比(OSNR)损耗为1 dB,PS-64QAM信号的OSNR损耗改善了0.5 dB。This study theoretically analyzed the reasons why,in the copolarized dual-pump scheme,wavelength conversion does not change the probability distribution of the probability shaping (PS) signal and the order of orthogonal frequency division multiplexing (OFDM) signal subcarriers can remain unchanged.Then,after all-optical wavelength conversion,the transmission of the PS-64QAM-OFDM signal through a highly nonlinear optical fiber in a homodyne coherent detection system was experimentally verified.Finally,the experimental results indicate that when the baud rate is20 Gbaud and the bit error rate is 1×10^(-2),the optical signal-to-noise ratio (OSNR) loss of an ordinary 64QAM signal is1 dB,and the OSNR loss for PS-64QAM signal is improved by 0.5 dB.

关 键 词：光纤光学与光通信 概率整形 正交频分复用 波长变换 非线性光纤 

分 类 号：O436[机械工程—光学工程]